Commercial Appliance Repair Service. Arrived at the client's location on 5/31/23 - Found wash tank drain stuck and will not move. Nothing is blocked inside, will order part and return. Returned to location on 6/6/23 - Removed front panel. Found drain sent out is 1” shorter than the one currently installed. Will not work with setup. Removed and replaced dry rotted leaking coupling. Managed to break valve free with extended pipe wrench setup. Slightly hard to turn at first but got looser after messing with it. Drain functions properly with no leaks. Operational.